This study will explore how the mind and the brain work to cause movement symptoms or seizures in people who do not have a recognized neurological or medical disorder. The study includes a check for psychiatric disorders, symptoms and their severity; psychiatric and personality questionnaires; and neuropsychological testing. Normal, healthy volunteers, people who have movement symptoms not due to a brain or medical disorder and people who have seizures not due to epilepsy may be eligible for this study. All candidates must be 18 years of age or older. All participants have a medical history, physical examination and psychological evaluation, including completion of questionnaires. People with movement symptoms or seizures have a symptoms evaluation. Some participants also undergo neuropsychological testing, including questionnaires, pen-and-paper or computerized tests, and motor tasks.
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